var UTCDate = '6/29/2011 4:52:48 PM';
var localDate = new Date(UTCDate + ' UTC');

// Get current local date and time
const localDate = new Date();
// Convert local date and time to UTC
const utcDate = new Date(localDate.getTime() + localDate.getTimezoneOffset() * 60000);
// Format the UTC date and time as a string
const utcDateString = utcDate.toISOString();
console.log(utcDateString);

// This would come from the server.
// Also, this whole block could probably be made into an mktime function.
// All very bare here for quick grasping.
d = new Date();
d.setUTCFullYear(2004);
d.setUTCMonth(1);
d.setUTCDate(29);
d.setUTCHours(2);
d.setUTCMinutes(45);
d.setUTCSeconds(26);
console.log(d); // -> Sat Feb 28 2004 23:45:26 GMT-0300 (BRT)
console.log(d.toLocaleString()); // -> Sat Feb 28 23:45:26 2004
console.log(d.toLocaleDateString()); // -> 02/28/2004
console.log(d.toLocaleTimeString()); // -> 23:45:26 Run code snippet

var date = new Date('6/29/2011 4:52:48 PM UTC');
date.toString() // "Wed Jun 29 2011 09:52:48 GMT-0700 (PDT)"

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